Regulated DC voltage power supply
AssigneeFuji Electric Co., Ltd.
InventorsAkira Saito, Tsuneo Watanabe
Life of this patent
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Abstract
A regulated DC voltage power supply including a plurality of power circuits connected in parallel, and a control circuit. Each of the power circuits includes a switching device that chops the input DC voltage, and the control circuit includes a detecting circuit, a control IC, and a timing adjusting circuit. The ripple components of the output voltage produced as the output of the parallely connected power circuits is less than the ripple components of individual power circuits. This makes it possible to realize a small, high efficiency regulated DC voltage power supply with low rated current semiconductor switching devices.
Claims6
A regulated DC voltage power supply comprising:
- a plurality of regulated DC voltage power supply circuit groups connected in parallel, each of which includes a plurality of power circuits which are connected in parallel, each of said power circuits including a semiconductor switch chopping an input voltage, and a filter smoothing the chopped voltage produced from said semiconductor switch;
- and
- control means for controlling switching timings of said semiconductor switch in each of said power circuits;
- said control means including,
- detecting means for detecting an amount corresponding to a load quantity required by a load,
- control means for starting generating, for each of said regulated DC voltage power supply circuit groups, an original switching signal when the detected amount exceeds a lower set value predetermined for each of said regulated DC voltage power supply circuit groups, and for stopping generating the original switching signal when the detected amount exceeds an upper set value predetermined for each of said regulated DC voltage power supply circuit groups, and
- timing adjusting means for generating a plurality of switching signals in response to said original switching signal, each of said switching signals turning on and off each one of said semiconductor switches of said plurality of power circuits at different timings.
Dependencies are inferred from the claim text.